THe 71s electron of an element X with an atomic number of 71 enters into the orbital:
6p
5d
4f
6s
Aufbau Principle -
In the ground state of the atoms, the orbitals are filled in order of their increasing energies.
- wherein
Pauli Exclusion Principle -
“No two electrons in an atom can have the same set of four quantum number" .
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Hund’s Rule of Maximum Multiplicity -
"pairing of electrons in the orbitals belonging to the same subshell ( p,d or f ) does not take place until each orbital belonging to that subshell has got one electron each i.e.,It is singly occupied.”
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As we have learned in MOT
The 71st electron will having an atomic number 71 will enter in 4F
6p
Option 2)5d
Option 3)4f
Option 4)6s
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